Tempekatuhe



(NovModel.)

.Jg M. HALSTBD.

y l DEVICE EUR REGULATING TEMPERATURE Patented Mar. 18, 1884:.

Atiornegp'.

N. PETERS mma-mmh. wasningiw, D C.

diarrea JAMES M. HALSTED, (DF-OAKLAND, CALIFORNIA, ASSIGNOR TO KATE K.HALSTED, OF SAME PLACE.

DEVICE FOR REGULATING TEMPERATURE.

Y SPECIFICATICN forming part of Letters Patent No. 295,384, dated March18, 1884.

Application dlcd August :'19, 1883. (No model.)

To ali, whomt may concern:

Be it known that l, .lutins M. Hnrsrnn, a citizen of the United States,residing at Oakland, in the county of Alameda and State of California,have invented a new a-nd useful Device for Regulating the Temperature inIncubators,- Hot-Houses, die., of which the following is aspecification, reference being had to the accompanying drawings.

My invention relates to incubators, hothouses, conservatories, halls,and dwellings generally wherein heat is required to be regulated; and itconsists in the improved device therefor, constructed and arranged tooperate as hereinafter described, whereby the temperature is bothautomatically and positively regulated, and its regulator is renderedeffective and certain in operation.

In the accompanying drawings, Figure l is a sectional elevation,illustrating my invention as applied to an incubator. Fig. 2 is an endview of a modification, and Fig. 3 is a side:y

This liquid may be water or any other, but I prefer to have a liquidwhich will not rapidly evaporate, and which will not become rancid. Ihave found that gl ycerine serves the purpose, and it is this liquidthat I use.

To the ceiling d is attached a bracket, M, to which is pivoted anair-tight casing,N, (here shown as a cylinder.) This casing isprovidedwith a neck, N, which projects downwardly into the liquid in the cup L.The end of the neck is open," and is the only entrance to the cylinder,which is otherwise air-tight. It is hung on its center of gravity withprecision, and may easily move upon its pivot-point.

Connected with the end of the casing N is a wire or rod, I), extendingdown through the bottom ofthe box or base of the incubator, andconnected with the end of a pivoted lever, Q, suspended under theincubator. The other end of lever Q is attached to rods or wires It,which are connected in any suitable manner with the burner of a lamp,and are adapted, upon the movement of the lever Q, to raise or lower thewich, or otherwise to decrease or increase the -iiame and heat.

The operation oi' this device is as follows: The casing N being full ofair, its neel; is extended down within the liquid of' the cup L, and theair within is thus confined. As the heat becomes greater and the airwithin becomesV lighter and expands, it presses against the liquid inthe neck, and thus lforces the casing (which is nicely pivoted) up. Itwill be seen that the air will not escape through the liquid, as it iseasier to move the casing. When the regulating casing or cylinder' movesits end upward, by reason of the expansion of the air within it, inducedby increased temperature in the incubator, the rod P will move the leverQ. to regulate the source of heat.

In the above-described arrangement, should the incubator become very hotat any time, through accident or otherwise, the air in the casing orcylinder becomes overheated and expands to such a degree as to drive theliquid out of the neel; N downward into the cup L, someof the airescaping up through the liquid into the chamber D. When the air left inthe casing cools again, it does not till the casing entirely, since theoriginal volumehas been diminished by the escape of a portion thereof;hence a slight vacuum is formed, to iill which some of the liquidcontained in the cup is forced f upward into the casing by atmosphericpressure. In this position the air contained in the casing is notsufficient to exert a heavy pressureon the liquid and cause its returnto the cup L and raise the casing, as originally intended. I obviatethis di'fiiculty by arranging in the end of lcasing X, or at any othersuitable point therein, an air-induction valve, A, the operation ofwhich is very simple. By opening the valve more air is admitted and willrush in to supply the deiiciency above mentioned., the liquid in theneck N being expelled down into the cup L, when the valve IOO can beclosed, and the casing returnsto its normal position, in readiness to beoperated anew.

For more effective useof the regulator, I 5 place in the cylinder orcasing N a transverse partition, Y, having an opening in the top, thusdividing` the casing into two compartments, opening into each otherthrough the top of the partition. This allows a free circulation of theair, and prevents the liquid which may be drawn up through the neck Ninto the cylinder from passing from one part of the casing to the other,as it would be'liablc to do were the cylinder tippedthe wrong way byaccident. It also keeps the liquid at the point farthest from the centerof gravity of the cylinder, thus allowing its most advantageous action.

In order to facilitato the regulator and cause it to change its limitsas regards the degree of temperature necessary to operate it, I use asmall weight, Z, adapted to be hung upon the lever Q. If I want todecrease the temperature of an apartment sooner than would be done bythe regulator unassisted, I move the weight Z out upon the lever Q,between its pivot-point and lamp-connections, to the point desired. Thiswill cause the cylinder orcasing N to rise before it would do so ofitself, and thus turn down the lamp sooner than otherwise. The oppositeof this result will be obtained by hanging the weight Z upon the lever Qbetween its pivot and the other end.

In Figs. 2 and 3 I have illustrated a modification of the arrangementhereinbefore described, consisting of a circular casing, N, having acylindrical extension, J, and a liquidspace, I, arranged around itslower side, the interior of the casing N communicating with 4o the saidliquid-space by means of an aperture,

j. The said casing N is adapted to revolve or turn on its longitudinalaXis, and is suspendedv by journals j j in hangers h for this purpose.Veights g, arranged on a cross-bar, f, secured to the forward journal,regulate the amount of inertia to be overcome by the casing, and hencethe degree of temperature required to move it. As the temperature rises,the air within the casing N and its extension expands and serves todrive the liquid to one side of the liquidchamber, and, changing thecenter of gravity of the casing N, effects a partial rotation of thesame, for the purpose described. W'hen the air-induction valve is openedand air admitted, the expanded air becomes condensed, and the weights greturn the casing N to its first position.

I claiml. rIhe combination, in an incubator or similar structure, of acasing adapted by the eX- pansion of air it contains to shift or movedevices controlling the heat source, and an airinduction valve admittingair to the casing to effect its return to its first position,vsubstantially as described.

2. The combination, in an incubator or similar structure, of a casingadapted by the eX- pansion of air it contains to act on a liquid cushioncontained in a cup beneath to raise said casing, for the purposedescribed, and an 7o I air-inductionvalve admitting air to the casing,substantially as set forth.

In testimony that I claim the foregoing as my own I have hereto affixedmy signature in presence of two witnesses.

JAMES M. HALSTED.

Vi tn esses: XVILL H. BURRALL, FRANK G. MCGANN.

